VIRAL VIDEO: Dinosaur startles employees at Chicago office

CHICAGO, IL -- A Chicago company was startled by a prehistoric visitor in its office Thursday morning.

Employees screamed and snapped photos as a frighteningly life-like baby Tyrannosaurus rex roamed Groupon's headquarters at 600 W. Chicago in River North.

The baby T. rex is part of the cast of "Walking with Dinosaurs - The Arena Spectactular", which Groupon sells tickets to on its website.

Groupon says there aren't any upcoming shows in Chicago, but the dinos are stored here when they're not on the road.